--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/front_processing/src/Fluid_manipulation/vsquare.pde	Thu Mar 22 16:00:17 2012 +0100
@@ -0,0 +1,82 @@
+/*
+* This file is part of the TraKERS\Front Processing package.
+*
+* (c) IRI <http://www.iri.centrepompidou.fr/>
+*
+* For the full copyright and license information, please view the LICENSE_FRONT
+* file that was distributed with this source code.
+*/
+
+class vsquare
+{
+    int x;
+    int y;
+    float xvel;
+    float yvel;
+    float col;
+
+    vsquare(int xIn,int yIn)
+    {
+        x = xIn;
+        y = yIn;
+    }
+
+    void addbuffer(int i, int u)
+    {
+        if(i>0 && i<lwidth && u>0 && u<lheight)
+        {
+            xvel += (vbuf[i-1][u-1].pressure*0.5
+            +vbuf[i-1][u].pressure
+            +vbuf[i-1][u+1].pressure*0.5
+            -vbuf[i+1][u-1].pressure*0.5
+            -vbuf[i+1][u].pressure
+            -vbuf[i+1][u+1].pressure*0.5
+            )*0.25;
+            yvel += (vbuf[i-1][u-1].pressure*0.5
+            +vbuf[i][u-1].pressure
+            +vbuf[i+1][u-1].pressure*0.5
+            -vbuf[i-1][u+1].pressure*0.5
+            -vbuf[i][u+1].pressure
+            -vbuf[i+1][u+1].pressure*0.5
+            )*0.25;
+        }
+    }
+
+    void updatevels(int mvelX, int mvelY, TuioPoint pt)
+    {
+        if(pt != null)
+        {
+            float adj = x - pt.getX();
+            float opp = y - pt.getY();
+            float dist = sqrt(opp*opp + adj*adj);
+            if(dist < PENSIZE)
+            {
+                if(dist < 4) dist = PENSIZE;
+                float mod = PENSIZE/dist;
+                xvel += mvelX*mod;
+                yvel += mvelY*mod;
+            }
+        }
+    
+        xvel *= 0.99;
+        yvel *= 0.99;
+    }
+
+    void display(int i, int u)
+    {
+        float tcol = 0;
+        if(col > 255) col = 255;
+        if(i>0 && i<lwidth-1 && u>0 && u<lheight-1)
+        {
+            tcol = (+ v[i][u+1].col + v[i+1][u].col + v[i+1][u+1].col*0.5)*0.4;
+            tcol = (int)(tcol+col*0.5);
+        }
+        else
+        {
+            tcol = (int)col;
+        }
+        fill(tcol, tcol, tcol);
+        rect(x,y,RES,RES);
+        //col = 32;
+    }
+}